Go Back   Trawler Forum > Maintenance and Systems > Power Systems

Thread Tools Display Modes
Old 04-05-2016, 03:45 PM   #1
Senior Member
obthomas's Avatar
City: Seabrook Texas
Country: USA
Vessel Name: TheVenture
Vessel Model: 1985 Bestway Labelle Sundeck 40ft
Join Date: May 2013
Posts: 460
Volvo Penta MS3C gear hesitates.

I wanted to post this in case someone else has the same problem I had with my Volvo Penta MS3C reverse gear.

My SB transmission was shifted at high RPM and glazed the clutch cone. How this happened is another story.

Anyway for some time now when shifted into forward my SB transmission would delay for about 10 seconds and then start turning the prop.

I read several online marine forum threads that seemed to indicate that the transmission could be taken apart and the clutch cone de-glazed with valve grinding compound. I watched several You-tube videos for this problem with outdrives and my gear. Volvo outdrives are very similar to my gear.

Last Friday I removed the reverse gear, took it apart and lapped the sliding sleeve cones in the gear cones with valve grinding paste and put the transmission back together and it worked. The delay is gone and the transmission shifts instantly.

The job is formidable because the transmission is heavy. The good thing is most of the parts came apart as assemblies. There were shims everywhere to keep track of.

The takaway here is that if your old mecanical Volvo Penta reverse gear is delaying going ito gear the problem is most likely glazed clutch cones and the repair is not as difficult as most might think.

obthomas is offline   Reply With Quote
Old 04-15-2016, 05:30 AM   #2
Veteran Member
City: thisted
Country: denmark
Vessel Name: Elviva
Vessel Model: trawl/tug Ejvind 25
Join Date: Mar 2014
Posts: 36
Well done, and thank you for the tip.
I myself has a cone clutch gear from Volvo Penta, mine Works fine after 42 years marine age,5.200 Work hours.
Once I put the forward gear in with too higth rpm. 1500 revs. and I had a hard time to get it in neutral, (do it before docking,else..you,re in trouble.)
gadenors is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 05:20 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012